TU Darmstadt / ULB / TUbiblio

Fracture behaviour in fibre reinforced ceramics

Hoffmann, Michael J. and Fiedler, Udo and Emmel, Thomas and Prielipp, Helge and Claussen, Nils and Gross, Dietmar and Rödel, Jürgen (1997):
Fracture behaviour in fibre reinforced ceramics.
45, In: Acta Materialia, (9), pp. 3609-3623, ISSN 1359-6454, [Online-Edition: http://dx.doi.org/10.1016/S1359-6454(97)00057-8],
[Article]

Abstract

The aim of the work is to gain a better understanding of the microprocesses involved in the fracture of ductile phase reinforced CMCs with an interpenetrating network microstructure, especially the processes involved in deformation and fracture of the ductile phase and its subsequent influence upon overall mechanical performance of the material. A model material is produced comprising regularly orientated aluminium fibres located within an alumina matrix. Compact tension samples, each produced with fibres orientated at 30 degrees, 60 degrees or 90 degrees to the fracture plane, are used to produce crack growth resistance curves and are then sliced to produce samples which are used to test the stress-extension, sigma(mu); behaviour of the ductile fibres. Fracture surfaces are analysed within the SEM. The sigma(mu) behaviour and fracture process of the fibres is modelled using both a dislocation pile-up model and FEM analysis. Comparison is made with a geometric ductile deformation model from the literature. The models are found to describe well the sigma(mu) experimental data and also the crack growth resistance results. II is found that ductile phase deformation and fracture is highly sensitive to the level of mechanical constraint upon the fibre. This is influenced by factors such as the porosity in the fibre, the interface strength and fibre orientation relative to the crack plane. Fibre diameter significantly affects sigma(mu) behaviour also. (C) 1997 Acta Metallurgica Inc.

Item Type: Article
Erschienen: 1997
Creators: Hoffmann, Michael J. and Fiedler, Udo and Emmel, Thomas and Prielipp, Helge and Claussen, Nils and Gross, Dietmar and Rödel, Jürgen
Title: Fracture behaviour in fibre reinforced ceramics
Language: English
Abstract:

The aim of the work is to gain a better understanding of the microprocesses involved in the fracture of ductile phase reinforced CMCs with an interpenetrating network microstructure, especially the processes involved in deformation and fracture of the ductile phase and its subsequent influence upon overall mechanical performance of the material. A model material is produced comprising regularly orientated aluminium fibres located within an alumina matrix. Compact tension samples, each produced with fibres orientated at 30 degrees, 60 degrees or 90 degrees to the fracture plane, are used to produce crack growth resistance curves and are then sliced to produce samples which are used to test the stress-extension, sigma(mu); behaviour of the ductile fibres. Fracture surfaces are analysed within the SEM. The sigma(mu) behaviour and fracture process of the fibres is modelled using both a dislocation pile-up model and FEM analysis. Comparison is made with a geometric ductile deformation model from the literature. The models are found to describe well the sigma(mu) experimental data and also the crack growth resistance results. II is found that ductile phase deformation and fracture is highly sensitive to the level of mechanical constraint upon the fibre. This is influenced by factors such as the porosity in the fibre, the interface strength and fibre orientation relative to the crack plane. Fibre diameter significantly affects sigma(mu) behaviour also. (C) 1997 Acta Metallurgica Inc.

Journal or Publication Title: Acta Materialia
Volume: 45
Number: 9
Uncontrolled Keywords: INTERPENETRATING NETWORKS; COMPOSITES; ALUMINA; ALLOYS; STRENGTH; INTERFACES; TOUGHNESS; GROWTH; MATRIX
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
Study Areas > Study Area Mechanic
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Study Areas
Date Deposited: 19 Nov 2008 16:03
Official URL: http://dx.doi.org/10.1016/S1359-6454(97)00057-8
Identification Number: doi:10.1016/S1359-6454(97)00057-8
License: [undefiniert]
Export:
Suche nach Titel in: TUfind oder in Google
Send an inquiry Send an inquiry

Options (only for editors)

View Item View Item